I'm looking to use a MIDI keyboard with this. Would I need to add some kind of MIDI interface, like a Yarns (or perhaps something even smaller)?

Also, if I want to get the 008 to sound unstable or if I want to add envelope capability, would it be as simple as just adding an LFO and/or envelope module(s)? If so perhaps someone could recommend a small, simple unit, perhaps even one that does both? Thanks!